I just read about this in an article about how they did some plants for
Shrek. They copied a base object multiple times, and only transformed it in
various ways. Also, for the trees, the leaves are generated by random number
sequences and applied/tesselated only in the renderer, thus the trees use
very little memory. They're meshes of course, but I don't see why this can't
work for all objects. I can't wait till I learn to program...

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